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Chow, et al.
2.2 Mechanical characterization

The tensile properties of the fabricated composite
Fabric silicone composite SILBIONE ® RTV 4410 1:1 A and B+0.2 wt% THI-VEX TM 0.4 3 1 and silicone gel were determined using the Instron
5566 universal mechanical test frame in accordance
with ASTM D638-14 (Type V specimen) at a
speed of 100 mm/min. The viscosity of silicone
ASTM D638-14 Type V SILBIONE ® RTV 4410 1:1 A and B+2 wt% THI-VEX TM 0 (Direct contact) thickener was tested by a rotational viscosity
print mixtures with different concentration of

meter at 0°C. The adhesion between the printed
silicone and fabric was tested in accordance with
ASTM D5169 at a speed of 305 mm/min. The
Silicone
dynamic stress-strain behavior of the composite
with repeated extension and recovery cycles was
1
3
measured to determine the loss of fabric tension
which would result in pressure degradation. A
total of 3000 tensile cycles were carried out with
Cyclic tensile testing Fabric silicone composite SILBIONE ® RTV 4410 1:1 A and B+0.2 wt% THI-VEX TM the Instron 5566 for the fabric and fabric silicone
composite samples, and the tensile values were
recorded. The parameters were a strain of 50%,
gauge length of 40 mm, and speed of 500 mm/min.

2.3 Pressure garment production and pressure
0.4
1
8
characterization
2 wt%_Thickener SILBIONE ® RTV 4410 1:1 A and B+2 wt% THI-VEX TM 0 (Direct contact) based on the scanned hand geometry data and
The patterns of pressure garment were developed
three reduction factors (namely, 0, 10%, and 20%
reduction in the width of the patterns), respectively.
A total of six pressure garments were custom-
10
5
made and their corresponding amount of pressure
Table 2. 3D printing parameters of the test samples.
0.2 wt%_ Thickener 0 (Direct contact) 10 5 dosage applied onto the HS with or absence of
silicone insert was measured and analyzed. The
fabric applied was same as the one for silicone
composite printing.
The exerted pressure to HS was evaluated by

between the pressure garment and the skin while
ASTM D5169 0.2 wt% _ Thickener_0.4 mm SILBIONE ® RTV 4410 1:1 A and B+0.2 wt% THI-VEX TM SILBIONE ® +2 wt% THI-VEX TM 0.4 10 5 NOVEL Pliance X system. The sensor was inserted
the hand was kept in a static relax position on a
table for 20 s for static pressure recording.

3 Results and discussion

3.1 Scanned geometry and structure of

First, the models for 3D printing (Figure 2A and B)
Testing Sample code Print mixture for the first layer Print mixture for the others layer Distance between the build platform and fabric (mm) No. of layer No. of sample 3D: Three-dimensional fabricated composites
were created based on the 3D- scanned geometry
of the hand to allow optimum fit of the insertion

International Journal of Bioprinting (2020)–Volume 6, Issue 2 73